216818852 has 6 divisors (see below), whose sum is σ = 379432998. Its totient is φ = 108409424.

The previous prime is 216818843. The next prime is 216818869. The reversal of 216818852 is 258818612.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 155102116 + 61716736 = 12454^2 + 7856^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27102353 + ... + 27102360.

It is an arithmetic number, because the mean of its divisors is an integer number (63238833).

Almost surely, 2^216818852 is an apocalyptic number.

It is an amenable number.

216818852 is a deficient number, since it is larger than the sum of its proper divisors (162614146).

216818852 is a wasteful number, since it uses less digits than its factorization.

216818852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54204717 (or 54204715 counting only the distinct ones).

The product of its digits is 61440, while the sum is 41.

The square root of 216818852 is about 14724.7700151819. The cubic root of 216818852 is about 600.7572402064.

The spelling of 216818852 in words is "two hundred sixteen million, eight hundred eighteen thousand, eight hundred fifty-two".